Discussion of LAA LBT Categories Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2015 Discussion of LAA LBT Categories Date: 2015-03-11 Authors: Notice: This document has been prepared to assist IEEE 802.19. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Alireza Babaei, CableLabs John Doe, Some Company

Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2015 Abstract This document discusses a recent agreement within 3GPP RAN1 regarding LBT (Listen-Before-Talk) categories. The purpose of this contribution is to highlight a question that can be asked of 3GPP RAN in a liaison communication to clarify the purpose of the LBT categories. Alireza Babaei, CableLabs John Doe, Some Company

RAN1#80 Agreement Regarding LBT Categories (1 of 2) March 2015 RAN1#80 Agreement Regarding LBT Categories (1 of 2) At RAN1#80 in February 2015, the following agreement was made and documented in [1]: Classify the evaluated LBT schemes according to the following categories: Category 1: No LBT Category 2: LBT without random back-off Category 3: LBT with random back-off with fixed size of contention window Category 4: LBT with random back-off with variable size of contention window (continued) Alireza Babaei, CableLabs

RAN1#80 Agreement Regarding LBT Categories (2 of 2) March 2015 RAN1#80 Agreement Regarding LBT Categories (2 of 2) Note: Contention window is the maximum possible random back-off value Note: Category classification does not restrict a LBT design investigation Note: Company is encouraged to evaluate many categories as much as possible Illustrative examples FBE procedure as defined in EN BRAN V1.8.0 belongs to category 2 LBE procedure with a fixed q for the contention window as defined in EN BRAN V1.8.0 belongs to category 3 LBE procedure Op A with a variable q for the contention window as defined in EN BRAN V1.8.0 belongs to category 4 Alireza Babaei, CableLabs

LBT Mandatory for 3GPP LAA (1 of 2) Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2015 LBT Mandatory for 3GPP LAA (1 of 2) Presentation from 3GPP [2] at IEEE 802 interim meeting in January 2015 included the following text on Slide 13: Agreed design targets: • Single global solution allowing compliance with any regional regulatory requirements • Effective and fair coexistence with Wi-Fi • Effective and fair coexistence among LAA networks deployed by different operators (continued) Load based equipment (LBE): Equipment where the transmit/receive structure is not fixed in time but demand-driven Frame based equipment (FBE): equipment where the transmit/receive structure is not directly demand-driven but has fixed timing Slide 5 Alireza Babaei, CableLabs John Doe, Some Company

LBT Mandatory for 3GPP LAA (2 of 2) Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2015 LBT Mandatory for 3GPP LAA (2 of 2) Based on the above targets, it was agreed that at least the following functionalities are required for LAA: 1. Listen‐before‐talk (Clear channel assessment) 2. Discontinuous transmission on a carrier with limited maximum transmission duration 3. Dynamic Frequency Selection for radar avoidance in certain bands/regions 4. Carrier selection 5. Transmit Power Control Note: not all functionalities may have a spec impact; not all functionalities would be mandatory for all LAA eNBs/UEs Load based equipment (LBE): Equipment where the transmit/receive structure is not fixed in time but demand-driven Frame based equipment (FBE): equipment where the transmit/receive structure is not directly demand-driven but has fixed timing Slide 6 Alireza Babaei, CableLabs John Doe, Some Company

Clarification/Explanation Needed March 2015 Clarification/Explanation Needed Given that LBT is considered to be required for 3GPP LAA, clarification/explanation is needed regarding the purpose and intent of Category 1 of the LBT schemes. A request of clarification/explanation can be done via a liaison communication from IEEE 802 to 3GPP RAN and 3GPP RAN1. IEEE 802 consensus is that LBT is essential to a global LAA solution IEEE 802 previously sent 3GPP liaison communication [3] that included the recommendation to evaluate alternatives to the fixed back-off mechanism in LBT (i.e., contention window size not fixed). Alireza Babaei, CableLabs

March 2015 References [1] RP-150271, “Status Report to TSG: Study on Licensed-Assisted Access to Unlicensed Spectrum,” 3GPP RAN #67, March 2015 [2] IEEE 802.19-15/0008r0, “3GPP & unlicensed spectrum,” Chairman of 3GPP TSG-RAN, IEEE 802 Interim Session, Jan 11-16, 2015 [3] Liaison to 3GPP TSG RAN, Statement Regarding Coexistence of Licensed Assisted Access (LAA) and IEEE 802 (02-Feb-15) Alireza Babaei, CableLabs